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"I start to leave,, and Peterson turns around and starts staring me down, giving me the evil look. I give him a dirty look back, and his look gets dirtier, and I say f--- you.So I mouthed f--- you. Just like that, it went very subtle," Ruby said.

Peterson then told his attorneys, and witnesses said Ruby's actions were witnessed by a sheriff's deputy.

Ruby was immediately escorted from the courtroom and won't be allowed to return, the spokesman said.

“I picked up 300 followers on my Twitter in the last two hours,” Ruby said. “They said ‘I wish we could have done what you did. You speak for America. We wish we could have seen you say that to him.’”

Ruby, who has no connection to the case, took out a full-page ad Aug. 7 in the Chicago Sun-Times blasting Peterson's legal team, whom he called the "Three Stooges With Sunglasses."

WLWT caught up with a longtime Ruby friend, former NFL player Tim Couch, who said Ruby says what he feels.

"I don't think it's a publicity stunt on his party by any means," he said. "He's someone who wants the right thing to happen. If his voice can help, he's going to go up there and say what he has to say."

Peterson is also suspected in the disappearance of his fourth wife, Stacy Peterson, in 2007. Her body has never been discovered, but after she vanished, authorities exhumed Savio's body and found evidence of foul play.

Ruby appeared on Fox News to discuss the ad, saying that Peterson's attorneys and everyone else knew that he was guilty in both women's deaths.

"The bottom line in court is, and you know, if you don't have money … there's no justice," Ruby said. "There's justice for the people who can afford the best attorneys."

This isn't the first time Ruby has taken interest in a high-profile murder case. He also took out a full-page ad last year in the Orlando Sentinel to protest the acquittal of Casey Anthony in the death of her 2-year-old daughter.

Ruby also refused to serve former NFL player O.J. Simpson, who was acquitted in the deaths of his wife and her friend, in 2007 at his steakhouse in Louisville.